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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
if you-re using the GTK3 stack take a look at https://github.com/bytebrew/slope.
If you-re looking for public domain software, checkout Nuklear, it has interactive plotting capabilities https://github.com/Immediate-Mode-UI/Nuklear
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.